Thanks for the response guys. I think about after 30 mins of sitting up nice and straight it ended up going away and I managed to get some sleep..

And my belly is definitely starting to get bigger. I sleep on my side and dont use a pillow or anything like that. I guess it would be worth to start putting a pillow under my belly!

And I only had 1 panadine forte with about 3 glasses of water, so didnt think that it would be a problem. I am going for a checkup tonight so I will make sure that I mention this.